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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb765233a9742fbb124bea73d2bc3886239cb08e078169a911c41f9176f9fce' 
  AND token = 'Qn9crP/nlU13S+P635QaCuZw7Xmn96Mg/bSOXPd75Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}